Are all kennedy half dollars made of silver? if not, what date did they stop making them with silver?

Question

Are all kennedy half dollars made of silver? if not, what date did they stop making them with silver?

Answer 1

See http://www.goldline.com/coins/product/ke...

Answer 2

For the half-dollars in regular circulation the last year they had any silver content was 1970.

This is the content of the Kennedy half-dollars from first striking in 1964:

Silver issue (regular circulation in year 1964, silver proof sets from 1992 to date):

Weight: 12.5 g

Composition: 90% silver, 10% copper

Silver content: 11.25 g (0.3617 troy oz)

Silver-clad issues (regular circulation in years 1965-1970, proof set in years 1975-1976):

Weight: 11.5 g

Composition:

Outer layers: 80% silver, 20% copper

Inner layers: 20.9% silver, 79.1% copper

Silver content: 4.60 g (0.1479 troy oz)

Copper-nickel clad issues (regular circulation from 1971 to date):

Weight: 11.34 g (0.4 oz avoirdupois)

Composition: 75% copper, 25% nickel